Ishida H, Naganuma H, Konno K, Sato M, Hamashima Y, Konno S, Watanabe S, Asanuma Y, Ishida J
First Department of Internal Medicine, Akita University School of Medicine, 1-1-1 Hondo, Akita City, Japan.
Abdom Imaging. 2000 Sep-Oct;25(5):554-8. doi: 10.1007/s002610000091.
This study, based on sonographic (US) results of 10 cases with histologically proven retroperitoneal liposarcoma (eight well-differentiated and two pleomorphic types), shows that the presence of fine echogenic lines within the tumor is a useful sign for diagnosing a well-differentiated liposarcoma. Presence of numerous fine fibrous septa in the lipomatous tumor tissue is thought to be responsible for this interesting phenomenon. Of interest is the fact that the direction of these lines changed according to the probe format used: parallel horizontal lines when using a linear probe and concentric lines converging toward the probe when using a sector or curved linear probe. In contrast, pleomorphic liposarcoma does not show this US sign. Knowledge of these US findings is useful for the diagnosis of retroperitoneal liposarcoma.
